There may be a kernal of truth to this, but the fact is, to do this with overwhelming force there needs to a strong social impetus to do this.

With drugs you had families ruined by drug addiction desperate for a solution.

With bitcoin you have... what? Unwavering respect for the right of governments to restrict something most people can identify has at least some utility?

The social consensus for a harsh crackdown is not there, and like the internet on issues with copyright, governments will continue to muddle along as this all evolves way quicker than they can deal with it (kind of like Uber).